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The skies over Gaza City were filled with huge plumes of smoke again on Tuesday as Israel intensified its four-week offensive in the Palestinian territory.

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Overnight on Monday Gaza saw one of its heaviest nights of bombardment, shortly after Israel's Prime Minister Benjamin Netanyahu warned of a long conflict ahead.

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Israeli forces struck by air, sea and land, lighting up the night sky with flare bursts and leaving long plumes of smoke trailing over Gaza City in the morning.

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Gaza's only power plant was damaged as Israel carried out 60 air strikes, also targeting sites associated with Hamas, the Islamist group which controls Gaza.

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At least 60 Palestinians were killed, according to local health officials. More than 1,100 Palestinians, most of them civilians, have been killed in the fighting since 8 July.